9
Burner power is regulated by changing primary air pressure.
To maintain combustion primary air pressure in inlet 1 with open electromagnetic valve has to
be more than 0.15 MPa and less than 0.3 MPa.
This value is set on the regulator for a burner with one air line (NORTEC WB60/120) and on a
regulator of line 1 (left manometer) for burners with two air lines (NORTEC WB230/270).
To adjust primary air pressure pull the pressure regulator cap up and rotate it to increase or
decrease the pressure.
To increase pressure rotate the regulator cap clockwise, to decrease it rotate the cap counter-
clockwise.
After adjustment press the cap lightly to get it back to its start position.
The set pressure is reflected on the manometer of each regulator.
The pressure in the second line of burners NORTEC WB 230/270 can be more than 0.4 MPa
and is chosen according to the allowed boiler power.
NB!
Sometimes the manometer shows the set pressure value with a closed
electromagnetic valve, but after it is open, the pressure falls abruptly. It’s important to
get the set pressure value by rotating the cap when the valve is open.
In case of condensed vapor in the drying filter box, pour it out by pressing the drain valve head.
8. Preliminary fuel heating temperature
Consistent fuel combustion are provided with fine spray and ignition. For this reason, the fuel is
heated in the preliminary heating chamber where fuel viscosity is lowered.
The preliminary heating chamber has two heaters each of which is controlled by its own
thermostat.
Thermostats knobs are placed on the front board of the heater (pic. 9).
Pic. 9. Regulating thermostats
Thermostat 1
Thermostat 2
